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LF: Re: Tacamo on 17.8 and 29.6 kHz and Jellyfish

from [Laurence KL7 L] [Permanent Link][Original]
To: Markus Vester <[email protected]>, "[email protected]" <[email protected]>
Subject: LF: Re: Tacamo on 17.8 and 29.6 kHz and Jellyfish
From: Laurence KL7 L <[email protected]>
Date: Sun, 19 Feb 2017 03:20:38 +0000
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Thread-topic: Tacamo on 17.8 and 29.6 kHz and Jellyfish

Hi Markus - and yes these are new local signals that have appeared over the last couple of weeks - One of them is dead on SAQs frequency so thats thats going tobe annoying and I may have to go onto one of the loops or mix/loop array to null it out. Im gradually being surrounded by new houses being built and it wasnt going to be too long before I see discrete or wideband effects from new installs.  The MSK on 23.4 and 22.8 are artifacts  and are specific to this antennae/sound card combo.  


NWC continues its beautiful display  on various paths (with a small flare added for sectioning)   http://kl7l.com/NWCJelly.jpg   and Ill take a look at HWU.  73 Laurence KL7L





From: Markus Vester <[email protected]>
Sent: Friday, February 17, 2017 8:05 PM
To: [email protected]
Subject: Re: Tacamo on 17.8 and 29.6 kHz
 
Hi Laurence,

nice spectrogram! That modulated carrier on 17.6 kHz looks like local QRM to me - motor controller, dog fence, lawnmower guide wire, or anything like that.

The MSK traces on 23.4 and 22.8 are presumably NLK and NML, mirrored down at the 24 kHz Nyquist limit.

Apropos NML: Have you tried to zoom in on HWU 21.75 kHz? You might see similar fringes to those we've been seeing on NML and others every night: 
https://groups.yahoo.com/neo/groups/VLF_Group/conversations/messages/25145
With the help of Peter (G3PLX) in the UK and Edgar in Tasmania, we have obtained some data on differential delays and direction of arrival of the reflected component. I have come to believe that the signals may be bouncing off the equatorial electrojet near the magnetic equator.

Best 73,
Markus

-----Ursprüngliche Mitteilung-----
Von: Laurence KL7 L <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 17. Feb 2017 21:24
Betreff: Re: VLF: Tacamo on 17.8 and 29.6 kHz

lots of interesting squiggles near there last night and today up in Alaska too


laurence
kl7l/kh6

On Feb 17, 2017, at 1:09 AM, Markus Vester <[email protected]> wrote:

Last night, strong Tacamo-like activity was observed on 17.8 kHz, and also on a more unusual QRG of 29.6 kHz with even larger bandwidth. My colour-DF grabber http://www.df6nm.de/vlf/vlfgrabber.htm indicates northwesterly incidence so presumably originating over the North Atlantic. The signals are also visible on Peter's daily spectrograms at http://www.df3lp.de/ .   

Best 73,
Markus (DF6NM)

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